filter.h

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/*
Copyright (c) 2016 Alexei Novakov
https://github.com/novalexei

Distributed under the Boost Software License, Version 1.0.
http://boost.org/LICENSE_1_0.txt
*/
#ifndef MOD_SERVLET_FILTER_H
#define MOD_SERVLET_FILTER_H

#include <servlet/request.h>
#include <servlet/response.h>
#include <servlet/context.h>

#define FILTER_EXPORT(factoryName, className) extern "C" servlet::http_filter* factoryName() { return new className{}; }

namespace servlet
{

class filter_chain;

class http_filter
{
public:
    http_filter() = default;
    virtual ~http_filter() noexcept = default;

    virtual void init() {}

    virtual void init(filter_config& cfg);

    virtual void do_filter(http_request& request, http_response& response, filter_chain& chain) = 0;

    const filter_config &get_filter_config() const { return *_cfg; }

    const std::string &get_filter_name() const { return _cfg->get_filter_name(); }

    const std::map<std::string, std::string, std::less<>>& get_init_parameters() const
    { return _cfg->get_init_parameters(); };

    template <typename KeyType>
    optional_ref<const std::string> get_init_parameter(const KeyType& name) const
    { return _cfg->get_init_parameter(name); }

private:
    filter_config* _cfg;
};

class filter_chain
{
public:
    virtual ~filter_chain() noexcept {};

    virtual void do_filter(http_request& request, http_response& response) = 0;
};

} // end of servlet namespace

#endif // MOD_SERVLET_FILTER_H